Mike Hanby wrote:
Howdy,
I'm looking at compiling Gromacs 4 for the Blue Gene/L and am stuck at
the compilation of the prerequisite FFTW 3.1.3.
If anyone out there has successfully cross compiled FFTW and Gromacs for
the Blue Gene, would you mind sharing your settings used to run the
./configure scripts?
I'm getting "cannot compute sizeof (unsigned int)" which tells me I'm
not giving it enough information for the cross compilation.
There's two key components: using the BG/L cross compilers (blrts_xlc
and blrts_xlf) and letting configure know that you are using cross
compilers, so that its tests are constructed using successful
compilation, not successful execution.
I've successfully used
#!/bin/bash
CFLAGS="-O5 -qbgl -qarch=440d
-qcache=level=1:type=i:size=32:line=32:assoc=64:cost=8
-qcache=level=1:type=d:size=32:line=32:assoc=64:cost=8
-qcache=level=2:type=c:size=4096:line=128:assoc=8:cost=40 -qnoautoconfig
-qfloat=norngchk -qhot -qignerrno"
./configure CC=blrts_xlc --host=powerpc --build=ppc64
Note that some of those compiler flags are probably redundant, and you
should read up on whether you actually want them all.
Mark
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